Hydraulic scale



Nov. 18, 1930.

G. W. CALVERT HYDRAULIC SCALE Filed Sept. 20, 1929 z7 1113mm #arye M [Z lyerz Patented Nov. 18 1930 UNITED STATES PATENT OFFICE HYDRAULIC SCALE Application filed September 20, 1929. Serial No. 394,001.

The present invention contemplates the provision of a hydraulic scale, wherein the weight of the'article placed up the scale platform exerts a downward pressure upon the body of liquid contained within the body of the scales, and causes said liquid to flow upwardly into a communicating graduated tube, until the levels of the liquid balance, whereupon the weight of the article may be readily and quickly determined.

The invention contemplates a novel construction and arrangement of parts, wherein the scale beam, piston and connecting rod is formed as a unit, with a view of simplifying the general construction and arrangement of the device.

The nature and advantages of the invention will be better understood when the following detail description is read in connection with the accompanying, the invention residing in the construction, combination and arrangement of parts as claimed.

In the drawing forming part of this application like numerals of reference indicate similar parts in the several views, and

wherein Figure 1-is a sectional 11 of Figure 2.

Figure 2 is a. sectional view taken on line 39 22 of Figure 1.

The body of the device is preferably of cylindrical contour indicated at 10, and this body is preferably threaded into a suitable base 11 formed with a centrally located stump 12. The upper portion of the body is preferably made in two sections which are connected together by a threaded band or ring 13, and these sections which are indicated at 14 are also threaded to the upper portion of the cylindrical body portion 10. The sec tions 14 constitute a bearing for the piston rod 15, integrally connected with the piston 16 and the scale platform 17.

A casting 18 is arranged at one side of the base 11 and supports a vertically disposed graduated tube 19 which communicates with the body 10 of the device through a vertical bore formed in the casting, and also through E a pipe 20 terminally connected with the casting 18 and with the stump 12 above referred.

view taken on line to. In addition to the vertically disposed bore 21 the casting 18 is also characterized by an obliquely disposed bore 22, which communicates with a funnel 23 supported upon the casting and having valve controlled com- 55 munication therewith. By reason of this construction it is manifest that the cylindrical body portion 10 can be quickly and easily partly filled with water through the funnel 23 and the pipe 20, and when a sufficient amount of water has been conveyed to the cylindrical body portion 10, the valve 24 for the funnel is closed. The graduated tube 19 is preferably constructed of glass or other transparent material, and carried by the u per end of this tube is a suitable bracket 25, with which the adjacent ends of vertically disposed rods 26 are connected, the lower ends of these rods being supported by the casting 18. The rods surround the tube 19 to protect the latter from injury.

In practice. the article to be weighed is placed upon the platform 17, and thereby exerts, a downward pressure upon the liquid 27 through the instrumentality of the piston 16. Consequently the liquid is forced through the pipe 20 into the casting 18, and then into the graduated tube 19, and when equilibrium level is reached, the weight of the article upon the platform 17 can be readily determined 0 by the graduations on the tube 19.

The entire device is very simple in construction, the piston 16, piston rod 15 and platform 17 being of a unitary construct-ion whichcan be readily and easily placed with- 8 in the body of the device or removed therefrom as the occasion may require, while the body 10 can be readily filled with liquid, or t-l latter can be quickly drained therefrom ugh the drain cock 28.

lVhile it is believed that from the foregoing description the nature and advantages of the invention will be readily apparent, I desire to have it understood that I do not limit myself to what is herein illustrated and described, and that such changes may be resorted towhen desired as fall within the scope of what is claimed.

What I claim is p 1. In a hydraulic scale, a body including a 1410 lower cylindrical portion closed at one end adapted to be partly filled with Water, and an upper portion comprising two semi-cylindrical sections, a ring holding said sections together and associated with said cylindrical portion of the body, a piston operating in said body, a piston rod, itSCftlGPlZltfOIIll sup ported by the piston rod, the juppersectious of the body constituting be 7 ngs for said piston rod, a casting arran d at one side of the body portion and having-a bore therethrough a pipe establishing communication between the casting and said cylindrical body portion, means for filling the body through said casting, and a gra'duate'd'tube supported by the casting and communicating with said'body portion.

portion closed partly-filled With Watena p ston operating ported by .a; graduated In 'a hydraulic scale a cylindrical body therein, a piston rod ascale platform -suphaving a bore therethrough, a horizontally arranged pipe establishing a communication between the casting and said body poi tion,

tube supported ,by the casting andcoinmunicating with said bore, said cast ing having an additional obliquelyidisposed bore and a funnel supported by the casting and having valve controlled vcommunication With the last mentioned bore.

Intestimony whereof I aiiix my signature.

GEORGE WASHINGTON CALVERT.

portion atone end and adapted to be I the upper end-of the piston rod, a 1 casting arranged at one side ofthe body and 

